Reset pagination on sorting

At first thanks for this awesome npm package, I really like its API and find it easy to use.

That said, I have a disagreement on how pagination should be handled when users sort data by clicking on a table column.

Currently when a user goes to let's say page 7 and then sorts the table differently, even-though the displayed data changed, page number remains 7.

In my humble opinion, the page number should be reset to 0 in that case.

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From a user perspective, I would say sorting data has a clear intent: finding the biggest/smallest value(s) among many rows. In this scenario, it makes sense to show the first page as the user probably doesn't care about seeing page 7 of the rearranged dataset.

This actually is the behaviour of all datatables I could test so far so I thought I should kindly point it out in this issue.

In the case you disagree with this view, I decided to take a look at how to implement this myself. However I couldn't find an elegant way to change the table internal page state.

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From what I understand, the table options `page` property is read only once when the MUIDataTable component mounts. It is then ignored upon re-rendereing.

That sounded a bit counter-intuitive to me as other options like `count` are read and updated on every render.

I think if the page option is read only once when the components gets mounted, it would make sense to rename it to `initalPage`. Then the option called `page` could actually be the property allowing developers to control the table page state.

## Expected Behavior
I was expecting pagination to get reset to 0 after clicking on a column, which sorts rows.

## Current Behavior
Page number remains the same regardless of user actions. In some cases it probably would makes sense to reset pagination or at let devs control it.

## Your Environment

| Tech | Version |
|--------------|---------|
| Material-UI | 4.5.2 |
| MUI-datatables | 2.12.4 |
| React | 16.11 |
| browser | Chrome |
| etc | |